Leroy-Somer VARMECA-20 Instrucciones De Parametrización página 79

LEROY-SOMER
Variable speed motors and geared motors
4.8.1 - Description of operation with
configuration 5
Sensor
0-10V or 4-20mA type (selection via mini dip K2).
The sensor PI feedback is expressed on a scale of 0 to
1000 pts:
- for the 0-10V sensor
eg: 0-10 bar sensor, for 5 bars it will read 500 pts.
- for the 4-20mA sensor
4mA 0 pts
20mA 1000pts
Operation on start-up
P1 draining pressure (% of sensor)
T1 draining time delay (in seconds T1 ≤ 120s)
This time delay is sufficient for starting; if P1 is not reached
during time T1 the underpressure fault (UNDER P1) appears
(P57 stored fault).
If the pump runs dry during operation
(P < P1) regulation will bring the motor up to maximum speed
after time T1; the underpressure fault appears.
Similarly, if there is a break in sensor feedback (0-10V or
4-20mA) the VARMECA 20 will trigger an underpressure
fault.
Automatic Run/Stop
T2 stop on minimum frequency time delay (in seconds
T2 ≤ 120s).
If the motor speed is around Fmin. during time delay T2, the
VARMECA 20 will cause the pump to stop.
During this period the VARMECA monitors the pressure and
restarts at 0.95 Pc (reference pressure) without a time delay.
Indication of operation (P57)
If the motor speed is at maximum for longer than 120s, the
red LED flashes to indicate operation at maximum flow.
"ALARM Q" is displayed.
If the motor is stopped during automatic operation, the
flashing red LED indicates that there is zero flow from the
pump.
"ALARM Q" is displayed.
Flow regulation at the maximum operating point
During operation while overloaded, the VARMECA will
automatically regulate itself around the rated current by
lowering the output frequency, but will not switch to fault
mode.
Special parameters for configuration 5 (level 50)
- P59 K coefficient for direct reading of the pressure and the
reference.
Eg: 0-10 bar sensor K = 10, it will read 10000 mbars etc
- P54 instability factor enables detection with the valve
closed.
- P58 digital value of the pressure reference (0 to 100% of the
reference sensor).
PARAMETER SETTING MANUAL
VARMECA 20
WIRING DIAGRAMS
Regulation references
- External 0-10V or 4-20mA type (selection via mini dip K1).
- Local mini-dip button K1 ON (0-10V).
- CVI VMA internal control card mini dip K1 ON (0-10V).
- Preset reference (P58: VP5) S1 contact on OFF express as
a % of the reference sensor.
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